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- 2015
天然钙镁矿物质粉填充竹木复合材料热裂解性能
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Abstract:
制备了不同天然钙镁矿物质粉填充量的竹木复合材料, 采用热重(TG)分析、 裂解-气相色谱-质谱联用(PY-GC/MS)、 Li Chung-Hsiung积分法与Malek法研究了天然钙镁矿物质粉填充竹木复合材料的热裂解性能及热裂解动力学, 并建立了天然钙镁矿物质粉填充竹木复合材料的热裂解模型。结果表明: 天然钙镁矿物质粉热裂解时能够吸收周围的热量, 产生的自由基抑制剂和难热裂解的CaO与MgO都能够抑制竹木复合材料的热裂解;裂解产物中, CO、 CO2及单苯环类芳香族化合物的含量与未填充竹木复合材料的相比均有所降低, 脂肪族化合物含量有所增加。未填充竹木复合材料的热裂解反应模式为随机核化, 每个粒子有1个核;天然钙镁矿物质粉填充竹木复合材料的热裂解反应模式为相界反应、 球形对称。 Bamboo-wood composites with different filling content of Ca and Mg natural mineral powder were prepared, and the thermal pyrolysis performances and pyrolysis kinetics of bamboo-wood composites filled with Ca and Mg natural mineral powder were investigated by thermal gravity (TG) analysis, pyrolysis-gas chromatography-mass spectrometry (PY-GC/MS), Li Chung-Hsiung integral method and Malek method. Then the pyrolysis model of bamboo-wood composites filled with Ca and Mg natural mineral powder was built. The results show that when the pyrolysis of natural mineral powder occurs, the heat around will be adsorbed. Then the pyrolysis of bamboo-wood composites is inhibited by the products of natural mineral powder pyrolysis, such as free radicals inhibitor as well as CaO and MgO which are difficult to pyrolysis. The contents of CO, CO2 and single benzodiazepines aromatic compounds in pyrolysis products decrease compared with those of unfilled bamboo-wood composites, while the content of aliphatic compounds increases. The pyrolysis reaction model of unfilled bamboo-wood composites is random nucleation, each particle has one nuclear, while the pyrolysis reaction model of bamboo-wood composites filled with Ca and Mg natural mineral powder is phase boundary reaction and spherical symmetry. 国家自然科学基金(31370569); 国家林业公益性行业科研重大专项(201204702); 湖南省科技重大专项(2011FJ1006)
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